Special offset number in FileStream Read

Question

Hello

Using FileStream.Read(MyBytes, 0, 32) I read the initial 32 bytes to read magic number.

To detect ISO CD/DVD image files, according to here, .iso file magic number is 43 44 30 30 31 but I have problem reading offset.

I don't know how to handle:

0x8001

0x8801

0x9001

Offset number is what I need to set in FileStream.Read(MyBytes, < Offset Number >, 32)

For all file types is usually 0, or 4 etc... No idea how to handle HEX number here? (main code in VB)

Answer 1

Try this:

fileStream.Position = 0x8001;
fileStream.Read(MyBytes, 0, 5);

Repeat it for 0x8801 and 0x9001.

Answer 2

vb.net supports hex literals

FileStream.Read(MyBytes, &H8001, 32)

Answer 3

oh, if I'm not wrong, 0x8001 equals 32769, does it mean:

FileStream.Read(MyBytes, 32769, 32)

?

Answer 4

yes, you can convert the hex value to decimal rather than letting the compiler do it. in both cases the compiler converts to binary.